This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | -1 |
| 5 | 1 |
| 6 | 0 |
| 7 | 1 |
| 8 | -1 |
| 9 | 1 |
| 10 | 0 |
| 11 | -3 |
| 12 | 3 |
| 13 | -1 |
| 14 | 1 |
| 15 | 0 |
| 16 | 5 |
| 17 | -5 |
| 18 | 17 |
| 19 | -2 |
| 20 | 1 |
| 21 | 0 |
| 22 | -691 |
| 23 | 691 |
| 24 | -118 |
| 25 | 41 |
| 26 | -5 |
| 27 | 1 |
| 28 | 0 |
| 29 | 35 |
| 30 | -35 |
| 31 | 359 |
| 32 | -44 |
| 33 | 14 |
| 34 | -1 |
| 35 | 1 |
| 36 | 0 |
| 37 | -3617 |
| 38 | 3617 |
| 39 | -1237 |
| 40 | 1519 |
| 41 | -293 |
| 42 | 22 |
| 43 | -7 |
| 44 | 1 |
| 45 | 0 |
| 46 | 43867 |
| 47 | -43867 |
| 48 | 750167 |
| 49 | -13166 |
| 50 | 2829 |
| 51 | -2258 |
| 52 | 217 |
| 53 | -4 |
| 54 | 1 |
| 55 | 0 |
| 56 | -1222277 |
| 57 | 1222277 |
| 58 | -627073 |
| 59 | 1540967 |
| 60 | -198793 |
| 61 | 689 |
| 62 | -235 |
| 63 | 46 |
| 64 | -3 |
| 65 | 1 |